Multirange radio receiving system



Nov. 24, 1936. s. WHISK 2,062,111

MULTIRANGE RADIO RECEIVING SYSTEM 4 Sheets-Sheet 1 Filed July 25, 1931 INVENTOR Jamaal W/zzk/r Nbv. 24, 1936;

S. WHISK MULTIRANGE RADIO RECEIVINQ SYSTEM Filed July .25, 1931 4 Sheets-Sheet 2 Q N N \4 INVENTOR Jamaal 71 /215]:

Nov. 24, 193 s. WHISK I 2,062,111

' MULTIRANGE RADIO RECEIVING SYSTEM Filed July 25, 1931 4 Sheets-Sheet 5 Nov. 24, 1936.

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8. WHISK 2,062,111

MUL'I'IRANGE RADIO RECEIVING SYSTEM Filed July 25, 1931 165 arz/m /0 70M: arm 0 mm; 571m: arms mew 4 SheetsSheet 4 INVENTOR dgmuel VV/zzlsk Patented Nov. 24, 1936 MULTIRANGE RADIO RECEIVING SYSTEM Samuel Whisk, Brooklyn, N. Y., assignor of fortyfive per cent to Boy I. Gerrlsh, New York, N. Y.

Application 'July 25, 1931, Serial a... 553,030

9 Claims. (01. 250-20) UNITED STATES PATENT OFFICE One of the important objects of the present invention is to provide a "universal form of radio apparatus for selecting and receiving radio signals of various types, such as short wave, long wave, commercial broadcast and television signals and it is a further object to accomplish this broad purpose in a relatively simple practical form of apparatus, free of complications and adapted to be handled by those familiar with the use of any ordinary receiver.

The foregoing and other desirable objects are attained in the present invention by the novel features of construction, combinations and relations of parts hereinafter disclosed.

The drawings accompanying and forming part of this specification illustrate certain practical embodiments of the invention but, as will appear, the actual physical structure may vary, all within the broad spirit and scope of the invention.

Fig. 1 is a schematic illustration of an embodiment of the invention, illustrating in particular the master switch control by which the different wave bands may be arbitrarily selected; Fig. 2 is a similar view'of another form of the invention, differing from the first principally in that provision is made for simultaneous reception of both television and commercial broadcast; Fig. 3 is a face view illustrating a simple panel arrangement for the apparatus;v Fig. 4 is a side elevation of the master switch unit, on an enlarged scale; Fig. 5 is a cross-sectional view of the latter on substantially the plane of line 5-5 01' Fig. 4; Fig. 6 is a detail view of the short wave transformers; Fig. 7'is an enlarged sectional detail of the latter.

In the wiring diagrams, Figs. 1 and 2, enough of the master switch is shown to disclose the control exercised over the various circuits. Details of this master control however are completely disclosed in Figs. 4 and 5, wherein it will be noted that the same consists of a single shaft 9, journalled in suitable bearings or end brackets l0, and carrying two sets of relatively insulated switch arms H, I2, 13,14, i5, l5, l1, l8, l9 and 20, 2|, 22, -23, 24, 25, 26, 21, 28, projecting radially in opposite directions to cooperate with oppositely disposed sets of contacts on the insulating bases 29, 30, ll, 32, 33, 34, 35, 36,31, rigidly secured in spaced relation between the end brackets by the spacingcollars 38 and th through bolts 39. For hand control purposes, 1; e shaft of this switch is equipped at one end with a suitable knob or handle 40, which may carry a pointer 4| to register with an indicating scale 42, Fig. 3, or with a series of indicating signal lights 43.

Either or both scale indications and signal lights may be employed.

In the present disclosure, the receiver is designed to operate in the following bands:

mefiers covering the short wave sta- 40 t n 1310118 550 to 1750 meters for long wave reception, 200 to 550 meters for commercial broadcast and 90 to 204 meters for television and the dial indications are accordingly so marked in Fig. 3-, with a distinctive signal light for each one of these bands.

Fig. 3 illustrates also a convenient and practical panel arrangement for tuning, in the different selected wave bands, the control button 44 at the right actuating a four-unit gang condenser for tuning, in all but the television bands and the left hand knob 45, serving for operating a three-unit gang condenser for tuning, in the television wave band. I

Referring now to the wiring diagrams, Figs. 1 and 2, it will be noted that six radio frequency transformers acting as separate antenna pickups 45, 41, 48, 49, 50, 5| are provided, one for each of the six wave bands, in the order listed above and that the corresponding transformers in each stage of amplification are correspondingly numbered, with the exponent a. Regeneration is employed for the short wave reception, the tickler" coils appearing at the right at 46b, 41b, 48b and being shown in detail in Figs. 6 and '7, to which reference will follow.

Two stages of radio, detector and two stages of audio frequency amplification are employed for general reception, except that on the short wave stations the grid return of the first radio frequency tube is grounded to prevent hum in the system. The two radio frequency tubes are indicated at 52, 53, a detector at 54, a first audio stage at 55 and a second audio stage at 56. In Fig. 2, the second audio stage is push-pull, but

in Fig. l, the second audio stage is coupled" into a power tube 51. Resistance filter coupling is employed mainly in the audio stages, as indicated at 58, 58, 50, and as shown particularly in Fig. 1, but, for the push-pull stage of amplification shown in Fig. 2, a transformer coupling 81 is employed.

50 In the Fig. 1 form of the invention, the same amplification stages are used both for television and for reception in the other wave bands, whereas in the Fig. 2 form of the invention, reception of television is eflected by a separate set of tubes 55 cated as an independently operable one, it will and amplifying stages. This latter form has the advantage that if desired, both television and broadcast receptionmay be effected simultaneously, but the first form has the advantage of greater simplicity, etc.

In the two views last referred to, the television apparatus is indicated by the representation of the neon tube at 62. To prevent oscillations from this tube feeding back into the system, there is provided in Fig. 1, a short circuiting switch 66 for by-passing this tube when the television is cut out of service and while this switch is indibe evident that the same may be connected up with or form a part of the master switch. In

such case, a by-passing resistance 64 is cut into the by-passing circuit, this having a by-passing filter 65 about the same, such resistance preventing surge from the power tube through the neon tube.

In the Fig. 2 or simultaneous broadcast and television form of the apparatus, oscillations of the neon tube are kept out of the system by the grounded filter resistances 66 at opposite sides of the tube. In both forms, a speaker such as shown at 61 in Fig. 2 may be used for tuning in the television signals, the same being shown as having a switch 66 by which it may be cut into or out of series relation with the television output.

The broadcast speaker is indicated at 69 in Fig. 2, it being understood that any such suitable instrument may be employed in both the systems illustrated.

In the combination machine, illustrated in Fig. 2, where separate amplification and detection are provided for the television signals, two stages of radio, detector and three stages of resistance coupled audio amplification are provided, the first and second radio stages being designated 16, H, the detector 1.2 and the three audio stages 13, 14, 15, respectively.

The power for the set may be supplied by the power pack indicated at 16 in Fig. 2 and comprising a suitable primary winding 11 with secondaries as follows: 16 for the rectifier; 19 for the B or plate supply for all the tubes; 66 for frequency tube 53.

quency television tubes; 62 for the push-pull amplifier tubes and 83 for the heating currentof the broadcast receiving tubes 52, 56, 54, 55.

The connections will be understood by considering a particular example, for instance, the one shown in Fig. 2, which is more in detail than the first illustration. In the position of the master switch shown in Figs. 2 and 5, that is with the indicator pointing to the short wave band indication 40-90 as in Fig. 3, the antenna system 64 is connected up through switch arm II with contact 65, connected by lead 66, with the 40-90 wave band radio frequency transformer 46, from which energy is taken off by connection 61 to switch point 86 of the fourth unit 32 of the master switch and thence by switch lever I4 and lead 69 to the grid of the second radio The output of this tube is transferred through lead 96 to switch arm I5 of the fifth switch unit and thence through contact 9| and connection 92 to the primary of transformer 46a, whose secondary connects by lead 96, contact 94 of the sixth switch unit, switch arm I6 and connection 95 to the grid of detector tube 54. The output of this tube goes by connection 96 to the switch arm I1 of the seventh switch unit, contact 91 and lead 96 to the tickler coil 46b and through choke 66 and connections I66 to the input of the first audio tube 55, which feeds directly into the transformer 6|, coupling to the push-pull amplification stage leading into the speaker 69. Under these conditions, with the first radio stage out of service, the grid return of such tube is grounded through the switch arm I2 of the second switch unit 66 by a .grid connection I6I from the tube and a grounding connection I62 extending from switch contact I66. It will be noted, that this particular switch contact is elongated to eflect the grounding of this tube also when the master switch is turned two stages to the right in Fig. 2, that is, to where the switch lever II of the first unit engages either The eighth unit 66 of the master switch controls the signal lights or indicators. In theillustration, Fig. 2, the switch lever I6 of this unit is signal light I66, indicating, Fig. 6, that the set is on the 46-90 meter wave band. 1 I

The last unit 61 of the master switch Is the on and on control governing the supply of power to the set through a long arcu'ate contact I61, con.- nected in the power line and engaged by switch lever I9. All the several switch units have a dummy contact I66 for this "01! position.

For reception on the long wave lengths, the master switch is turned one position to the lei't in Fig. 2, so that switch lever II of the first unit engages contact I69 connected by wiring II6 with the long wave length transformer 49. Inthis case, the first radio frequency tube 62 is cut into service by the switch lever I2 of the second unit engaging contact III connected with thesecondary of coil 49, the output of this transformer then going from lever l2 by conductor I6I direct to the grid of said first radio frequency tube. Also in serving to effect the illumination of the. fourth the switch position under consideration, switchlever I6 of the third unitconnected through lead II2 with the output of tube 62 will carry current through contact II6 to primary of the first radio connecting by wiring 95 to the grid of detector I tube 54. The output of this tube connects by wiring 96 to switch lever I1 of the seventh unit. which in the case under consideration, will engage along a three-position c'ontact.i26 connected by wiring I 2| to the input of audio frequencytube 55.

For reception on the ordinary commercial broadcast band, 206-556 meters, the master switch is turned a further point to the left, so as to bring the several switch levers II, I 2, I 6, etc., into engagement with the two-position contacts I22, I26, I24, I25, I26, I21 of the first six switch units, by which action, circuits are established through connections I26I29 to the broadcast pickup coil 56, from the secondary ofsuch transformer through RF transformer 56a to contact I26 of the second unit and by way of switch lever I2 and connection IM to the first radio frequency tube 52, the output of such tube going by connection -I I2 to the third switch lever I3, contact I24 and connection I30 to primary of second radio frequency transformer 50a, the secondary of this transformer being in the grid circuit in second radio frequency tube 53, which latter circuit is at such time completed through connection 39 to the fourth switch lever I4, contact I25 and connection I3I; the output of the second radio frequency tube is carried by wiring 90, switch lever I5, contact I26 and connection I32 to primary of third radio frequency -transformer 50a and the secondary of this transformer feeds into the detector tube 54, through connections 95, switch arm I6, contact I21 and wiring I33; the seventh switch arm I1 is at such time engaged with the threeposition contact I20 and thereby carries the out- .put of the detector through wire 96 and connecantenna coil, radio frequency and detector cirtions I2I, I to the audio amplifier stages 55, 56 for speaker 63.

For the reception of television with broadcast, the master switch is turned a further step to the left, that is to the final left hand position in Fig. 2, whereupon in addition to the broadcast receiving connections last described, the connections for television reception will be established as follows: Through the second switch arm 20 of the first unit, contact I34 and connection I35 to the television coils and from there by way of connection I36 to contact I31 of the second unit and switch arm 2I and connection I 38 to the input of the first television radio frequency tube 10. The output of this tube goes by wiring I39 to the second switch arm 22 of the third unit and contact I40 and connection I4I to the first television radio frequency transformer 5Ia. The latter feeds into the second television radio frequency tube 1i by way of connections I42, contact I43 and second switch lever 23 of the fourthA Jnit and the output of this second radio frequency tube is fed by connections I44 to the second switch arm 24 of the fifth switch unit, contact I45 and connection I46 to the second radio frequency transformer Bla, the secondary of the latter feeding into the input of detector tube 12 by way of connections I41, contact I48 and switch arm 25 of the sixth switch unit. The output of detector 12is carried by connection I49, the switch arm 28 of the seventh switch unit, contact I50 and wiring I5I to the first audio amplifier 13. In this setting of the apparatus, the second switch arm 21 of the eighth switch unit makes engagement with contact I52, to thereby establish through connections I53 the necessary circuits for the television radio frequency tubes secondary 8I. The last switch unit, in such position, establishes through the second switch arm 23 and contact I54, an energizing circuit by way of connection I55 for the television power tube 15, which is thereby connected up with its energizing second-' ary 80.

The tuning in the various wave bands selected by the master switch is accomplished in the illustration, Figs. 2 and 3, for broadcast or speech reception by operation of the control knob 44, which is hooked up with the four tuning condensers I56; I 51,' I 58, I59 in the antenna, radio frequency and detector circuits of the tubes I2, 53, 54.

For television, the tuning is accomplished by the knob 45, Fig. 3, which operates the three tuning condensers I60, I6I, I62, Fig. 2, in the cuits of the television tubes 10, H, 12.

The special short wave transformers are all made up as a single unit, as illustrated in Figs.

changing coils or shifting other parts, thus keeping the capacity of the set constant and enabling the stations to be always brought in on the same dial settings. Short wave, long wave, commercial broadcast or television, or television with broadcast may be selected at will by simply setting the master switch for the wave band and then tuning in the desired station or stations in such wave band. The terminal apparatus or devices, such as loud speaker or television instruments in the output, as in the case of a radio reception system or the transmitting devices in the input side, as in the case of a transmitting station, are thus used for the different wave bands selected by the master control, being cut into service relation with the different special circuits for such wave bandsand the tuning being accomplished through such selected circuits by the special tuning controls. In the first circuit arrangement illustrated, the tuning control composed of the gang condensers I56, I51, I58, I59, is used in common with all the selected circuits, whereas in the Fig. 2 arrangement for simultaneous broadcast and television, a special control consisting of gang condensers I60, I6I, I62, 18 provided for television tuning. Thus in the first example for tuning in the selected wave band, it is only necessary to use the right hand tuning knob 44 in Fig. 3, but with a system such as shown in the second view, the television tuning would be accomplished by the left hand knob 45. The radio frequency tube or tubes which are not in use at any time, such as the first radio frequency tube 52, in the position of the switch shown in Fig. 2, have their grid connections automatically grounded (at the second switch unit 30), so as to eliminate the hum or distortion which would result from an open grid circuit. In theFig. 1 form of the invention, where the television is out of service when the set is used for other reception, the neon tube 62 of the television portion of the apparatus is protected by the resistance 64 which is by-passed about the same and which has a lesser resistance value than the neon tube. Sudden voltage rise which would then unbalance the circuits back through power tube 51 and coupled tubes 56, 55 is thus prevented. In the Fig. 2 form of the apparatus, similar protection is afforded by the resistance groundedfilters 66 about the neon tube.

While the invention has been described particularly in connection with radio reception, it will be obvious to those skilled in the art that the features of the invention may be applied to radio transmission as well. Also it will be clear that many changes may be made in the structure without departure from the true spirit and broad scope of the invention. Accordingly the terms employed herein should be considered as used in a descriptive, rather than in a limiting sense,

' posed by the state of the prior art.

coupling to' said television reception device, including a group of radio frequency transformers and master switch mechanism for selectively connecting the different radio frequency transformers in the tunable circuits for said sound translation device for the reception of audible signals within distinct wave ranges and for connecting said group of radio frequency transformers in the tunable circuits coupled to the television reception device for enabling television reception separate from sound reception in the selected frequency ranges.

- 2. Radio apparatus of the character disclosed comprising in combination,-a sound translation device, tunable circuits adapted to be coupled thereto and including separate radio frequency transformers for different frequency ranges, a television reception device, tunable circuits'for coupling to said television reception device, including a group of radio frequency transformers and master switch mechanism for selectively connecting the different radio frequency transformers in the tunable circuits for said sound translation device for the reception of audible signals within distinct wave ranges and for connecting Said group of radio frequency transformers in the tunable circuits coupled to the television reception device for enabling television reception separate from sound reception in the selected frequency ranges, said tunable circuits coupled to the sound translation device including tuning means common to a number of said sound translation circuits and separate special tuning means for said television circuit.

3. In apparatus of the character disclosed, the combination of coil systems for different wave bands, television reception instrumentalities having a device adapted to feed back undesired currents to said coil systems, broadcast reception instrumentalities, master switch mechanism for selectively connecting said coil systems with said instrumentalities and means for bypassing such currents to ground.

4. In apparatus of the character disclosed, the combination of coil systems for different wave bands, television reception instrumentalities having a device adapted to feed back undesired cur-' rents to said coil systems, broadcast reception instrumentalities, master switch mechanism for selectively connecting said coil systems with said instrumentalities and means for bypassing such currents to ground, including grounded filter resistance.

5. In apparatus of the character disclosed, the combination of coil systems for different wave bands, television reception instrumentalities having a device adapted to feed back undesired currents to said coil systems, broadcast reception instrumentalities, master switch mechanism for se- 60 lectively connecting said coil systems with said instrumentalities and means for by-passing such currents to ground, the television instrumentalities including a television signal responsive tube which will set up undesirable oscillationsand the protective means including a grounded resistance by-pass about said tube.

6. In apparatus of the character disclosed, the

I combination of coil systems for different wave bands, television reception instrumentalities having a device adapted to feed back undesired currents to said coil systems, broadcast reception in-' strumentalities, master switch mechanism for selectively connecting -said coil systems with said instrumentalities and means for by-passing such currents to ground, the television instrumentalities includinga television signal responsive tube which will set up undesirable oscillations and the protective means including a grounded resistance by-pass about said tube and a switch for cutting said resistance out of circuit or into grounding by-passing relation about said tube.

7. Radio receiving apparatus comprising in combination, an A. 0. power source, ungrounded radio frequency and detector stages energized by said power source and circuit controlling connections between said parts and including a master witch for disconnecting from said power source and grounding a previously ungrounded radio frequency stage with respect to the balance of the combination.

8. Broadcast reception apparatus including ungrounded radio frequency amplifier stages and coil systems for short wave and other wave bands and a master switch control for selecting said coil systems and including means for automatically disconnecting from other radio frequency stage or stages and grounding a previously ungrounded radio frequency stage in a short wave receptive position of the same.

9. A multi-range radio system, comprising in combination, tunable circuits including coil groups .for different frequency ranges and adjustable tuning means for tuning operations in each of the frequency ranges of the different coil groups, switch means for selecting the coil groups for each frequency range and for connecting in the tuning means for selected frequency ranges, distinctive illuminable signal indicators identifying the different frequency ranges, means for selectively illuminating said signal indicators and including illuminating circuits and switch means for selecting the respective signal indicator illuminating circuits according to frequency ranges selected and a common control for operating both the switch means for selecting the coil groups and tuning means for desired frequency ranges and the switch means for effecting the illumination of the'signal indicators respectively identifying such frequency ranges.

SAMUEL WHISK; 

